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  • Articles  (50)
  • Springer  (37)
  • Wiley  (13)
  • 1990-1994  (50)
  • Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition  (44)
  • Geography  (7)
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  • Articles  (50)
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  • 1
    Electronic Resource
    Electronic Resource
    Airborne pollen and spores of León (Spain) (1993)
    Springer
    International journal of biometeorology 37 (1993), S. 89-95 
    Details
    ISSN: 1432-1254
    Keywords: Airborne pollen ; Airborne spores ; Pollen diagrams ; Meteorological factors
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geography , Physics
    Notes: Abstract A qualitative and quantitative analysis of airborne pollen and spores was carried out over 2 years (from September 1987 to August 1989) in the city of León. Slides were prepared daily using a volumetric pollen trap, which was placed on the Faculty of Veterinary Science building (University of León) 12m above ground-level. Fifty-one pollen types were observed; the most important of these were: Cupressaceae during the winter,Pinus andQuercus in spring, and Poaceae, Leguminosae and Chenopodiaceae in the summer. The results also showed the existence of a rich mould spore assemblage in the atmosphere. The group of Amerospores (Penicillium, Aspergillus andCladosporium) as well as Dictyospores (Alternaria) were the most abundant;Puccinia was common in the air in August. Fluctuations in the total pollen and spores m3 of air were compared with meteorological parameters (temperature, relative humidity and rainfall). From the daily sampling of the atmosphere of León, considering the maximum and minimum temperature and duration of rainfall, the start of the pollen grain season was observed generally to coincide with a rise in temperature in the absence of rain.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01214387
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  • 2
    Electronic Resource
    Electronic Resource
    In vitro decay of Aextoxicon punctatum and Fagus sylvatica woods by white and brown-rot fungi (1993)
    Springer
    Wood science and technology 27 (1993), S. 295-307 
    Details
    ISSN: 1432-5225
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Summary The in vitro decay of Aextoxicon punctatum and Fagus sylvatica wood by the fungi Trametes versicolor, Ganoderma australe, Phlebia chrysocrea and Lentinus cyathiformis was studied by the agar-block method, and then the decayed woods were analyzed by chemical and spectroscopic techniques. The results demonstrated the strong resistance of the A. punctatum wood to the brown-rot fungus L. cyathiformis; the resistance might be related to the low S/G lignin ratio in this Austral hardwood. Wood decay by the Austral white-rot fungi G. australe and P. chrysocrea was rather limited, and preferential degradation of lignin was not produced although all the fungi studied increased wood digestibility. The most characteristic white and brown-rot decay patterns were observed during the in vitro decay with T. versicolor and L. cyathiformis, respectively. Trametes versicolor caused high weight losses and reduced the lignin content of the wood, whereas L. cyathiformis produced a preferential removal of xylan. No important changes in the solid-state 13C NMR spectra were observed after wood degradation by T. versicolor, but this technique evidenced an increase in aromatic carbon by L. cyathiformis. This increase was higher than that found in the Klason lignin content, suggesting the presence of altered lignin fractions in the brown-rotted wood.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00195308
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  • 3
    Electronic Resource
    Electronic Resource
    Science and people: Honduran campesinos and natural pest control inventions (1994)
    Springer
    Agriculture and human values 11 (1994), S. 178-182 
    Details
    ISSN: 1572-8366
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Farmers are experts on their natural environment and are innate experimenters. However they do not know everything. Filling in gaps of missing farmer knowledge can help them improve their experiments. The authors designed and taught a course to Honduran farmers that effectively covered a number of key points on insect ecology and biology that farmers had not understood. After receiving the course many farmers did experiments to solve pest problems without synthetic pesticides.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01530459
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  • 4
    Electronic Resource
    Electronic Resource
    The 1987–88 Alaskan Bight tsunamis: Deep ocean data and model comparisons (1991)
    Springer
    Natural hazards 4 (1991), S. 119-139 
    Details
    ISSN: 1573-0840
    Keywords: Tsunamis ; ocean measurements ; model comparisons
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Geography , Geosciences
    Notes: Abstract Excellent deep ocean records have been obtained of two tsunamis recently generated in the Alaskan Bight on 30 November 1987 and 6 March 1988, providing the best available data set to date for comparison with tsunami generation/propagation models. Simulations have been performed with SWAN, a nonlinear shallow water numerical model, using source terms estimated by a seafloor deformation model based on the rectangular fault plane formalism. The tsunami waveform obtained from the model is quite sensitive to the specific source assumed. Significant differences were found between the computations and observations of the 30 November 1987 tsunami, suggesting inadequate knowledge of the source characteristics. Fair agreement was found between the data and the model for the first few waves of the 6 March 1988 tsunami. Model estimates of the seismic moment and total slip along the fault plane are also in fair agreement with those derived from the published Harvard centroid solution for the 6 March 1988 event, implying that the computed seafloor deformation does bear some similarity to the actual source.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00162783
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  • 5
    Electronic Resource
    Electronic Resource
    Effect of the insecticide methidathion on agricultural soil microflora (1992)
    Springer
    Biology and fertility of soils 13 (1992), S. 173-175 
    Details
    ISSN: 1432-0789
    Keywords: Methidathion ; Soil microflora ; Enumeration of functional bacterial groups ; Acetylene reduction assay ; ARA
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary We studied the effects of the organophosphorus insecticide methidathion, at concentrations of 10, 50, 100, 200 and 300 μg g-1 in an agricultural soil, on fungi, total bacterial populations, aerobic N2-fixing bacteria, denitrifying bacteria, nitrifying bacteria (phases I and II), and nitrogenase activity (acetylene reduction assay). The presence of 10–300 μg g-1 of methidathion significantly increased fungal populations (colony-forming units). Denitrifying bacteria, aerobic N2-fixing bacteria and N2 fixation were significantly increased at concentrations of 50–300 μg g-1. The total number of bacteria increased significantly at concentrations of 100–300 μg g-1. Nitrifying bacteria decreased initially at concentrations of 300 μg g-1, but recovered rapidly to levels similar to those in the control soil without the insecticide.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00336275
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  • 6
    Electronic Resource
    Electronic Resource
    Nitrogen forms in 1- to 7-year-old opencast lignite mine soils (1993)
    Springer
    Biology and fertility of soils 16 (1993), S. 173-178 
    Details
    ISSN: 1432-0789
    Keywords: Organic N forms ; Soil reclamation ; Lignite mine soils ; Amino acid N ; Unknown hydrolysable N ; Humus
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract We studied the distribution of different forms of N in very young (0- to 7-year-old) soils from the Meirama lignite mine in northwest Spain. Total N increased rapidly with soil age, largely in the humic acid-associated fraction. Acid hydrolysis indicated that amino acid N and a hydrolysable unknown form of N increased with soil age. The fractionation reported by Bettany et al. (1980) indicated that alkali/pyrophosphate-extractable humus increased with soil age. All these data suggest that there is rapid stabilization of organic N during the first few years of evolution of these mine soils, to the extent that distribution of N forms in the 7-year-old soil is very similar to that in native soils.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00361403
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  • 7
    Electronic Resource
    Electronic Resource
    Kinetics and mechanism of acetic acid pulping of detannined Pinus pinaster bark (1994)
    Springer
    Wood science and technology 28 (1994), S. 403-408 
    Details
    ISSN: 1432-5225
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Summary The observed kinetics of Pinus pinaster bark with acetic acid after alkali treatment, with or without intervening acid prehydrolysis, are satisfactorily explained by a model involving both solubilization and condensation reactions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00225459
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  • 8
    Electronic Resource
    Electronic Resource
    An energy budget forArtemia franciscana under laboratory conditions (1994)
    Springer
    International journal of salt lake research 3 (1994), S. 1-7 
    Details
    ISSN: 1573-8590
    Keywords: energy budget ; Artemia franciscana ; Baja California ; México
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geography
    Notes: Abstract An energy budget forArtemia franciscana is described. Differences between males and females are ascribed to several causes but result in higher rates of female biomass production.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01990637
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  • 9
    Electronic Resource
    Electronic Resource
    Effect of the insecticides methylpyrimifos and chlorpyrifos on soil microflora in an agricultural loam (1992)
    Springer
    Plant and soil 147 (1992), S. 25-30 
    Details
    ISSN: 1573-5036
    Keywords: chlorpyrifos ; insecticides ; methylpyrimifos ; organophosphorus ; soil microflora
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract A study of the effects of two selected organophosphorus insecticides methylpyrimifos and chlorpyrifos on soil microflora in an agricultural loam was made. The insecticides had concentrations of 10 to 300 μg g−1. The presence of methylpyrimifos at concentrations of 100 to 300 μg g−1 or chlorpyrifos at concentrations from 10 to 300 μg g−1 significantly decreased aerobic dinitrogen fixing bacteria and dinitrogen fixation. Nitrifying bacteria decreased at concentrations of 200 and 300 μg g−1 of methylpyrimifos. The presence of 10 to 300 μg g−1 of chlorpyrifos decreased the total number of bacteria. However, fungal populations and denitrifying bacteria were not affected as a consequence of the addition of the organophosphorus insecticides to the agricultural soil, showing that these microorganisms can tolerate high amounts of those insecticides.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00009367
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  • 10
    Electronic Resource
    Electronic Resource
    Comparison between a chemical and a biological method to determine the N mineralization potential of temperate-humid region soils (1994)
    Springer
    Plant and soil 162 (1994), S. 147-150 
    Details
    ISSN: 1573-5036
    Keywords: biological method ; chemical method ; mineralization potential ; nitrogen ; soil incubation ; temperate humid-zone
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract The potentially mineralizable organic N of 33 different soils was estimated by a chemical test (hot extraction with 2N KCl) and the values compared with those previously obtained by a biological method (aerobic incubation in the laboratory). On average, the organic N solubilized by the chemical procedure was significantly lower than that mineralized by a two weeks aerobic incubation for all the soils as a whole. The same was true for soils developed over acid rocks and over sediments. However, the values obtained for the soils developed over limestone and basic rocks were similar by both methods. The values obtained by both methods were not significantly correlated neither when considering all soils together nor when considering different groups according to soil management or parent material. Significant correlations between both methods were only found when the soils were separated into two groups according to their organic N content: soils with less than 400 mg N 100 g−1 soil and soils with more than 400 mg N 100 g−1 soil. The organic N solubilized by the chemical procedure was significantly correlated with the hexosamine-N content; however, it was not correlated with the factors that control the biological mineralization of the organic N, except with the soluble Al content. Therefore, the chemical extraction did not seem to address the biologically active N pool in a selective way.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01416100
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